METHOD AND DEVICE FOR TREATING LIQUID SLUDGE AND FILTER CAKES OBTAINED BY SAID METHOD

摘要

Treating and conditioning liquid sludge and a solidified sludge cake obtained thereby are disclosed. A first emulsion of sludge is formed in an in-line container fed at a first flow rate Q owing to the impact of the sludge with air injected into the container at a rate Q′, where Q′>5Q, in a first region which has a small volume of less than 0.05 m3. The first emulsion is then transferred into a second region of the container extending over a first length, and is then discharged via a component which generates a head loss in a chamber extending over a second length. A flocculant is injected in order to obtain a second coagulated emulsion, which is at least partially degasified. The matter in suspension in the second emulsion obtained in this way is then filtered or decanted.

主权项

1. A process for treating and conditioning liquid sludges, in which a first sludge emulsion is created in a pressurized online container, continuously fed with the sludge, via piping, at a first flow rate Q (m3/h), by blasting the sludge with air injected into the container at a flow rate Q′ (Nm3/h), with Q′>5Q, the said first emulsion is discharged at the outlet of the container via a member generating a pressure drop, and then the suspended matter of the emulsion thus obtained is filtered off or left to settle, separating it from the liquid part which is continuously emptied out,
wherein, in order to create said first emulsion by blasting the sludge with air, the sludge and the air are injected into a first zone with the container, and the emulsion thus formed is discharged toward a second zone of the container extending over a predetermined first length L1, the injection of air and sludge into the first zone and the length L1 being suitable for constituting said first emulsion formed from drops of sludge in the air, then said discharging of the first emulsion of the container is carried out via the member generating a pressure drop in a tubular enclosure extending over a predetermined second length L2, into which at least one flocculant is injected, in order to obtain in said enclosure a second emulsion of air in the coagulated and flocculated sludge, and in that said second emulsion is at least partially degassed by venting of the enclosure before said filtration or settling.